ALEXANDRIA, Va., July 21 -- United States Patent no. 12,687,519, issued on July 21, was assigned to Itron Inc. (Liberty Lake, Wash.).

"Dual-gas metering system and method" was invented by Pierre-Olivier Jandaud (Macon, France), Karsten Hugler (Woerth, Germany) and Thibaut Meurisse (Macon, France).

According to the abstract* released by the U.S. Patent & Trademark Office: "A dual-gas metering system and method is described herein, wherein percentages of two types of gas in a gas flow are determined. The system uses two speed of sound measurements, and calculates a percentage of hydrogen gas within a mixture of natural gas and hydrogen gas. In a further example, a first speed of sound within a single type of gas (e.g., natural gas) is obtai...